Well again Sarah, consider what I mentioned earlier about angels. Every angel mentioned in the Scriptures is a man.
There is a myth that has been taught for a while about angels and it is the myth that angels are asexual. When we study what the Scriptures teach about angels, we see the total opposite. Angels in the Scriptures actually were able to have sexual relations. We know this because of the Days opf Noah. When the sons of God, an Old Testament term for "Angels." And these sons of God (angels) left their first estate and came down to the earth to lay with the women because they saw that they were fair:
6 And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them,
2 That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose.
3 And the Lord said, My spirit shall not always strive with man, for that he also is flesh: yet his days shall be an hundred and twenty years.
4 There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown.
5 And God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.
6 And it repented the Lord that he had made man on the earth, and it grieved him at his heart. - Genesis 6:1-6 (Holy Bible)Now also remember Sarah that the term Sodomy can also be applied to bestiality. So I think that the term "strange flesh" could possibly also be referring to bestiality in addition to the sin of Sodomy. And I do see your argument about strange flesh regarding men with angels, but again the sin would still be Sodomy because angels are men. Angels can have sexual relations.That has been established already because of the historical account given in Genesis 6.
Therefore, because angels are able to have sexual relations, the very act of angels being with men would be an act of Sodomy.
And of course, what also has been established already is that the very sin that was going on in the cities of Sodom and Gomorrah was the sin of Sodomy.
And again; in the city of Sodom, the other iniquities that were prevalent there were those listed in Ezekiel 16:49.